[oilypuddlefield]

According to a copy of an AMAL  ID reference, your carb...389/234 was actually outfitted for a US market 1966 BSA Thunderbolt 650.
The correct carb number for your Trail Blazer is- 389/16
Interestingly, they show as having the same bore size (1-1/8) just different jets and throttle slide cutaways
                                                                                                           Needle
                                                                          Bore Pilot Cutaway Main Jet  Position

389/234 BSA 650cc 1966; A65 Thunderbolt (USA) 1 1/8" 25     3.5     310 0.106   3
389/16 Indian 692cc 1958-60; Trailblazer Twin      1 1/8" 30     3.5     270 0.106   2

Theoretically, you could rebuild your carb with new parts to suit and take a chance. OR buy a new one from Burlen and save the gamble.

[TonyVanda]

Thanks for the info opf. I'll have a closer look at mine. Where is the best place to get parts from?
Regards
Tv

[oilypuddlefield]

Probably the best option for parts...
https://amalcarb.co.uk/monobloc-series.htm
Hitchcocks should have the correct bits as well.
Or prowl around on eBay.
One thing with old Amals, which you might already be aware of is, the mating flanges warp and can allow air to get past the O-ring.
I've always filed and sanded them flat.
Some brave souls have rigged up a contraption to draw them back flat by way of a T bolt affair run through the bore.
Try at your own risk !

[TonyVanda]

Dropped the crank at the crank grinders. Turns out we worked together 40 years ago (furniture retail business) so most of our conversation was about that. He reassured me my crank was in the right hands. He's still doing it after 40 years and reckons it's hard to retire because no-one does this stuff any more and none of the young blokes are interested. His mate does rebores so he's got the barrels and pistons so hopefully, wont be too long before I might be able to fit the short motor.

Got a long way to go yet. Learning something new every time I get something done.

[Adrian II]

Unfortunately these guys won't be around for ever, and it does need younger blood to carry this stuff on. Does your crank grinder want you as a mature apprentice? Assuming you're not already the same age as he is?

A.

[TonyVanda]

Naah Adrian, we are the same age. I wouldn't be looking to do an apprenticeship in that field anyway. I already get too much oil under my fingernails. Besides, for what he is charging, I'd just as sooner get him to do it.

The resto process is great fun and I learn stuff every day. I'd like to learn how to use a metal lathe one of these days. They look like a handy bit of kit.

[oilypuddlefield]

Stay away from metal lathes !They're only the beginning. Once you have learned that, then comes the milling machine.
Then you start collecting tools and gadgets so you can  make "stuff". And the smell of cutting oil will permeate your clothes.
After awhile, your shop will be the only place that makes sense !
Speaking from 40+ years as a self employed metal cutter.

[Adrian II]

The clever thing for most of us to do is actually become good friends with a man in your position! (Says the man with no machinist buddies...)

A.