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They will be fine, but as said you need to up the compression. I'm using the KB400 .040 pistons .024 below the deck and running a Comp cams 275DEH 235/482, Holley 3310, 1 3/4 headers, 3:55 sure grip, and 2400 stall. My heads were cc'd at 86 and I had them milled .030 bringing them to 80. I'm at 9.9 to 1 compression. Camquest says 430 horsepower. I'm thinking more like 400.
You need to measure first the actual comp. now.
You could mill your block .020 and be .004 below the deck and use the .039 Felpro gasket.
This is the exact combo i have in 68 charger i have .047 quench with .039 felpro , but i have the block decked and comp cams 275 HL cam and 2800-3000m ptc converter , runs kick ass w 750 hp vacumm secondary .
1969 Dodge Charger
1969 Dodge Superbee
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