The Vortec top end is a good plan, but only to get accessory bolt holes and the later/revised intake manifold bolt pattern to use the TBI top end.
The early Power Pack heads are excellent, and worked very well on 283 engines from that period. They had very small/efficient runners, small valves, and tiny combustion chambers, making them very well suited to the little 3" stroke 283's in low performance applications.
It wasn't uncommon at all to see them knocking down excellent fuel economy (some over 20mpg's) in full size Impala's with PG transmissions and low (numerical) axle ratios.
The 283 crank in the 327 block has always been one of my favorite small block Chevy engines. They LOVE to rev, and don't even really start sounding good till they get past 6000rpm's!.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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