Heads

Unless there is a specific goal in mind, and one that’s going to require the heads be pretty “good”, then for the most part any true 340/360 head should be suitable(with the appropriate work) for the typical hot street 340/360 build in the 350-450hp range.

That being said, the effective quench “easy button” is closed chamber heads with flat top or inverted dome pistons at zero deck height.

Depending on local labor rates, it’s pretty easy to spend “new head” money reburbishing old iron heads that would be capable of making similar power.
Wow a lot of things to think about I ran a automotive machine shop in the late 70's and have built every big block out there and drag raced with a 427 punched 30 11to1 pistons ZL1 camshaft 513 gear 4 spd and I ran 10.3 in the quarter mile so I still know a lot of things but keep the info coming I am going to run a flat tappet cam shaft with 474 lift . I like all the new info I'm getting you people are great. Thanks John. PS I had a 72 Duster 340 4 spd for 24 years.