@joshhhhhhugo yeah, I'm (very slowly) working my way through a similar conversion, except I'm using a B21A as per Volvo's original spec for the kit.
The main things to consider, assuming you're starting with a K-Jet B23, are:
- You'll need to remove the current fuel pump setup and either install a mechanical pump (or some other carby fuelling solution)
- You'll need to blank the K-Jet injector holes in the head. This can be done with a thread tap and some bungs, but you'd want to be extremely careful of swarf if you have the head on the car. In fact, forget that, take the head off to do this conversion.
- You will need different intake ducting. If you go with Volvo's original design, you'll also need to relocate the washer reservoir to the passenger strut tower.
- You'll obviously need to have a new exhaust made up
- You'll need to learn how to rebuild and tune Stromberg carbs (it uses a 175 CD)
- You'll need to learn how to adjust a points-type distributor, and you'll want to own a dwell angle meter also
- Alternatively, you can YOLO it like me and buy a 123ignition distributor (~$600), and tune the curves yourself. I only did this because the B21AT distributor I have is well wrecked, and I also have a different cam to the original B21A spec (A cam vs my K cam, plus I want to tinker with cams more)
- There's more parts you'll need, though Iceton can probably supply them also. First item that comes to mind is a choke cable.
This kit is designed for a maximum boost of I think 4psi, which is very low. I'm building it out of a love for how unusual it is, rather than to try and make "real power". For what it's worth, I think an EFI turbo setup would be way less hassle and probably ultimately less money.