[fjrgary]

would like to get a little more a$$ out of my fe. 68 side oiler with original 2x4 holley 600 set up (low riser) and factory hp cam. heads however are off a 63 390 (c1ae-6090-a). wondering how much a set of edels or blue thunder would impact performance, or should i look elsewhere, maby new heads together with??????? hoping some of the engine builders will chime in, however all suggestions are appreciated. thanks gary.