I did a /6 to a 318 swap because I had a teen in my '72 when I was 18 yrs old. And besides, a basket case 318 was in the trunk of the '72 duster that my wife got me for Christmas in 2010.
.040 over, K.B flat top pistons, Comp Cam 20-223-3 cam - 268/280 with .477/.480, RHS Indy 360 X heads 1.920"/1.624", Comp Cams 137 lb behive springs, Comp Cam roller tip rockers, Edlebrock 9176 Performer intake, Holley dbl pumper 650 carb with metering plates, Holley mech fuel pump, Hooker 9501 ceramic headers coated inside and out, balanced and blueprinted.