Summit 2801 or 2802. I like to think that the 2801 is a high lift version of the Pontiac 068, and the 2802 is a high lift version of the Pontiac 744. The Summit cams are the cheapest. Crower cams are the highest.
The Melling SPC-3 is similar to the Pontiac 744 cam, used in some early '69 RA3 stick cars. Has lots of adv duration, to help bleed off a little compression. It used the non-adjustable system. But, I along with most others, recommend an adjustable system.
https://www.amazon.com/Melling-SPC-3.../dp/B000C4PQA8
The Lunati 10511004 is similar, but has less dur @ .050 lift, a 110° LSA, & slightly more lift.
https://www.lunatipower.com/factory-...8-301-313.html
The Melling SPC-7 is similar to the Pontiac 068 cam.
https://www.autozone.com/internal-en...07135_705947_0
From what I've read, those pistons at .040 in hole should be detonation prone.
You can get a ruff estimate on the CR with this calculator.
http://www.wallaceracing.com/cr_test2.php
"...5140 rods, this build doesn't need 4340..."
With the current price of the 5140 rods, the $400 RPM H-beams are a much better buy, IMO. Lighter, stronger, & only a very few dollars more.
https://butlerperformance.com/i-3164...tegory:1234812
http://www.racingpartsmaximum.com/sa...elhbeam-2.html