Senior Tech Team
Join Date: Jan 2000
Location: Garden Grove, CA, U.S.A.
...when you ask an opinion...multiple answers you will get.
If he wants to build a 427 there will be no harm done, so let him do it. Too bad he wants a hydraulic roller - he'll miss out on the solid flat tappet/solid roller rpm capability of the 427. A 427 at 7,000+ rpm has a song of its own. Have him sell the rectangular port heads and get ovals instead. I cannot think of any sub 6,500 rpm 427 that would need the port volume of the rectangular port heads.
El Caminos a pair: '67 Bomber, '65 496
Avanti, Corvette and more