Also may want to make sure your connections are all tight and clean. A loose or corroded connection can have power and then when you try to crank it will lose the connection altogether. Check ground cable on the block for good tight connection and again on starter. Also i posted a wiring diagram in this section for 70 gtos, maybe this can help you out some. Here is the link:
http://forums.performanceyears.com/g...1&m=8226040322
GR-RRR!
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1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi.
Everything installed, fired up and tuning has begun!
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