My home ported 302 heads....what do you see?

Again... I'm just experimenting; doing what everybody is doing or what everybody tells you should do...isn't innovative.

I'm almost ready to get this beast running and so far no issues with clearances.

There are certainly two opinions on using #302 heads. I subscribe to neither.

My goal is taking this heavy Chrysler 5th Ave(#3780 lbs) with advertised HP rating of 140 and a 1/4 Mile time in the high 17 second to a #3450 lb(Currently) HP rating of ~275 and a 1/4 Mile in Mid to Low 14's.

Wish me luck....

Using different valves, bigger will generally always raise compression a lil. The main thing here is they won't make a torque monster 'relatively speaking' unless they flow what a 360 head flows.
You want velocity with flow, not just velocity.

A factory 340 made what, 340 ft lbs of torque?
Make 318/273 heads follow with what some 587/915 castings flow and it can make 40 lbs more tq.