I vote next build-off should go as follows
318 +.040 (325ci) Mopar VS 327ci chebby
9.5:1 comp
air gap intake
similar spec hyd flat tappet cam
1-5/8" headers
for cylinder heads I reckon double humps vs 915 J's. both with a nice valve job.
Hit up the dyno and run the numbers.
THEN...