So how do you tell which a12 is which

Ok guys, I have an a15 I picked up, with no cam shaft, I've been considering buying a tomei cam for it as I build it, but obviously that's expensive.
My q is this, I have 2 A12s sitting in the garage, could I regrind and fit one of these and use it in my a15? Is it possible or costly to have it ground similar in spec to a tomei, I've been considering?
I've red the tech section and I'm aware fitting the right can is possible, but it does confuse me a tad.
Normally I'd ask my mech mate for advice, but he's currently incommunicado for some reason

We understand your dilemma buddy. We are just trying to help with the process of elimination. Your saying it gets fuel, and now you've swapped the points you get spark. That just leaves idle and timing(especially if you've swapped the manifold and are not getting excessive air.
So it basically boils down to 2 main points to check and sort, before we get into the nitty gritty of this tiny piece or that tiny piece.

You said it was running ok, the bucked and not doesn't run? Honest truth in all my years of playing with cars, Ive found sometimes the simplest and smallest thing can upset everything..

As another idea too is pulled the spark plugs, and check for fouling..

Check your timing..

I hate that colour, my engine bay, and interior paint is that colour.. Thank The Lord the rest is white!

I agree with ddgonzal. Sounds like a points issue.

Doors sold pending payment

I appreciate what your asking, but I'll be honest.. I need them gone asap, need the room

Ok. Doors 20 each.. Also on eBay guards and bonnet

Really? I've got 2 a12s and 3 4 speed gearboxes. So it's just kinda taking up room