I'd go for the 440-1 Indy heads (from someone like Dwayne Porter) w/ the Indy 440-3 intake and at east a 2" primary header w/ 3.5" collectors. Possibly change the cam to match if funds allow.
The -1 heads might not be the cheapest option, but they have the most potential.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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