Looking for inspiration for my 67. Numbers matching 400, bone stock minus an edelbrock carb and an electric choke. Currently has a flowmaster exhaust. Manual swapping, so hit me with transmissions you like too.
What's your dream build? Tri-Power? Efi? Let's see it.
Frame is also stock, so let's not get too crazy with the torque.
If it requires boring out the block, bonus points if you can get me a name of somebody in LA that can do it.
(1) For me, a good Muncie 4-speed is the ONLY way to go. The gear ratio you'll need for trans & rear end will depend on the stroke & low rpm torque of your engine build.
(2) I'm a Q-jet guy, all the way ! Since your engine is numbers matching, just seems to NEED a correctly rebuilt Q-jet.
(3) I like 455 or more cubes, because of the extra low rpm torque. But, if your crank is good, a correctly built 3.75 stroke engine can produce plenty of tire smokin power.
(4) Factory 670 heads provide too much compression for today's pump gas. So, if you keep 'em, you'll need to use dish pistons, to reduce the CR.
(5) Unless you want a really lumpy idle, an 068 clone, or a Summit 2801 will be plenty of cam. But, there are others that will make more power and produce a different idle sound.
(6) If by "LA" you mean the state of Louisiana, I can help you with an engine builder. If you mean Los Angeles, probably not. You might contact Leo Glasbrenner, at his transmission shop, REMAC Transmissions. He is a long time Pontiac drag racer. He can probably help you find a machine shop.
John & Ryan Schloe also race Pontiacs. They can probably help you.
MANY who have numbers matching engines, store that engine, for future sale with car, then build the engine they want. Here are a 455 & a 400 crate engine, just to give you an idea.
There are LOTS of Pontiac engine options, such as forged rods & pistons, alum heads, roller cams & rockers, alum intakes, etc.