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I need input on recommended spark plug for my 340. I'm running forged flat tops with J heads with 2.02 intakes. 484 lift MP purple shaft hydraulic cam with Torker 340 intake and Holley Street Avenger 780 CFM vacuum secondaries. Header and 2 1/2 exhaust through flow masters. Chrome box...

What is the volume of J-heads with cast# of 3418915 and 2.02 intake 1.60 exhaust? trying to estimate my compression ratio. Running flat tops with two valve relief cuts and close to .012 below deck.

this number is on right front of block of 1970 340 FW340P32320228 with iron cross after it. Does this help with what car it came out of? Is there a decoder for these numbers?

Are there any free desktop dyno programs out there? Or how else can estimate H.P. from my 340?

looking for some info..I have a 1970 340 with J heads.. both have J cast on outside and 3418915 cast top and bottom. both heads have stamp 10871 on edge by front lower head bolt. left head has 360 cast on top by valve spring and other has 340 cast in same spot and also has U cast under intake...