4.1 is the same as a hot air block just more displacement. Whats your goals it might be a waste of time and money if you just want to run 12's 
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84 Grand National Converted to Lc2 
109 Cat Girdled, Rjc crank scraper, earl brown hv front cover, cryoed stock crank cut 10/10, rods, 30 over speed pro, balanced 50/50 on bob weights, comp cams revolutionary 210/215 roller, 14 bolt gn1 aluminum heads, scorpion roller rockers, champion ported intake, 62 mm tb, 3.5 ss dp, ta knock offs, atr 3inch duals, 60 lbs inj, maft pro, lc1, factory hydroboost, Rjc deep pan, lightining rod shifters, Taylor 10.0 wires, powerstroke ic, dual fans etc.
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