I have a sbc 350 with stock heads, 2.02 intake valves 1.60 exhaust, 9.8 comp, and this is the type of cam I have installed. also have edelbrock 750 carb, MSD streetfire HEI.
Part Number 12-213-3
Grind Number CS 292H-10
Gross Valve Lift 0.501 0.501
Duration At 0.006 Tappet Lift 292 292
Valve Timing At 0.006
Open Close
Intake 40 72
Exhaust 80 32
Duration At 0.05 244 244
Lobe Lift 0.334 0.334
Lobe Separation 110

my question is what heat range and spark plug type does everyone recommend!!!

thanks for everybody help!

What Type Plugs it takes??? Taper seat or regular short reach? Or the year model of the heads?

1970 stock 350 heads

Since your compression is slightly higher than stock, start out with one step colder than the recommended plug for that engine. Take the vehicle out on an open highway, that has room for you to pull off the pavement. Drive at normal cruising speed for several miles than turn off the engine and coast off the road, without allowing the engine to idle. Pull all of the plugs and take a reading with a lighted plug viewer. Best plug color is light brown to light grey. I have had good luck with Autolite plugs.

Start here:

http://www.strappe.com/plugs.html

I would start out with good, old, extended reach AC44's, or the equivalent to them. Nothing is gained by running plugs that are too cold.