Your best best is ls1tech or if you can weld/can afford to have it done take a pair of 351 Fox swap headers, cut off the flanges, and weld on LS flanges which can be bought for about $50 from a GM dealer.
Set in Dallas on CL for $250 right now...get you some flanges from Scoggin Dickey and you're good to go. I might can save you a drive. Possibly headed to Ft Worth next Wednesday to get some rims and I have family in Healdton. PM me if you're interested.
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