[AdamHoud]

I will dyno mine when I finally figure out the throttle bracket issue and put a few miles on it. It has 40K original miles on the bottom end, and tested 155-160 psi on all cylinders.

I am running the following:
73 block stock with flattop pistons
69' 46 heads 72cc
crower 60240 210/221 422/446
71' stock iron 4bbl manifold
77ish jeff walker rebuilt qjet
RA manifold repros
pypes x-pipe setup

I wonder if you could get some extra power somewhere in your exhaust?

[Overkillphil]

I have had good experiences with the Pontiac 350's over the years. These days we really don't bother with them anymore. But back in the 80's they were commonplace as most older Pontiacs we bought had one of them in place. The darn things are nearly impossible to kill!

We found that doing the minimal made them work best all around. Nothing fancy needed. The stock heads were plenty, and the 350 likes both the small and large valve heads, just pick the cam accordingly. Compression isn't critical either, as we had 7.6:1 screamers as well as a couple of 9:1 varieties.

The performer intake or good stock iron with either a decent Qjet or 600 (650 max) Holley carb works well.

The most surprising combo we had was a 79 T/A we bought with a blown (that's blown apart, not supercharged) 301. We swapped in a 73 350 with fresh 6X-4 heads from a 76 350, an 067 cam (broomstick!), performer intake, elcheapo Cassler 4 tube headers, 2.25 dual exh. w/turbo mufflers, Holley 600 w/vac. sec., turbo 350 w/shift kit, and of all things the stock 3.08 posi out back.

That car ran consistent 14 flat with good traction. While that sounds boring to most of us today, it was quite a surprise to us back then with the low compression and semi-tall gears.

Imagine if someone put some effort into it?

Another one of our old thrown together combos was a 76 Bird that ran a Pontiac 350 with the stock 6X-4 heads, but ran a 650 mech. sec. holley on a 68 iron intake, 3.42 gears, as well as a Crower 280 Monarch cam. That one went high 13's but idled rough and was not any quicker out of the hole than the 79, undoubtedly due to the more aggressive cam which nullified the advantage of the steeper gears.

The 350 Pontiac is a much maligned engine. Nowadays it doesn't make any sense to build one for performance reasons, but not because it is a bad engine. Rather it doesn't make good financial sense when it costs the same or less to build a 400 or 455. And since none of them are really common anymore to stumble across, even the good running stockers have all but dried up. FWIW.