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Just add a point of reference to this discussion. My 360 is 30 over with . I have stock magnum heads and run a Comp XE268H cam (224/230 @ 50, .509/.512 lift with the magnum 1.6 rockers). I have a high rise dual plane intake, 600 CFM vac secondary holley, 1 5/8 headers, A833OD and 3.55 gears.

This combo is making approximatley 370 HP based on 102 mph trap speed.



The key phrase: zero decked KB107 pistons

That makes all the difference.
If he's running a 509 cam and low compression, it's going to be a PIG. Without compression and a matching intake that cam won't do anything but make him beat his head against the wall.
I remember running a MP 509 cam in my 8:1 440 with a Performer intake. It was horrible. The car had trouble doing a burnout with the stock converter. Once the engine was over 3000 rpm it would start to pull. The intake held it back on the top end.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon