Righteo, so 4x4 stroke and bore with a range of 67 to 80 thou down the hole, a 78.8cc head and 40 thou gasket...
... youre looking at a best case scnario of 9.17:1 and a worst case scenario of 8.96:1 with 80 down the hole.
A closed chamber 302 head at 58cc gives you a range of 11.3:1 to 10.96:1 with the same deck depths.
If you have 8cc dish pistons its more like 10:1 with a 58cc head and 80 thou depth.
What pistons you have will govern what you want to run, but I'd be going with the 302C heads regardless. 10:1 is going to open up your camshafts a lot better than 9:1, it'll go better and be easier on the juice, too.
Weiand intake and E-907-P here we come!
the old .. hidden wiring hunt..
@BGDAV drove me nuts because he hid the wires for the speedo sender lol.. makes it hard to tap into when the plug and the loom are completely GONE from the engine bay lol.