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I took my original J-code motor out for safe keeping but the motor I replaced it with is also a 68 302.The only difference is it has 69 302 heads so I'm unsure of the compression (I'm guesstimating between 9 and 9.5 to 1).I have a comp cams magnum 292 518L and 244 [email protected] weiand xellerator intake with Holley 650 dp,heddman long tube headers and comp cams roller tip rockers.The heads have stock size valves and were given a quick port job by me.I haven't had the car on the dyno but with an et of 13.69 @ 100.94 all the calculations say its making about 265-270 hp.I'm unsure if this is at the wheels or flywheel.I'm running a 4 speed toploader for a trans.
 

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If it's any help the '69 302 heads had 58.2 cc chambers vs '68 heads with 63cc chambers. So, 58.2cc on stock engine gave 9.5/1 comp ratio, 63cc on stock engine gave 9.0/1 comp ratio.
Paul
 
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