318 build up
The XE275 HI Lift cam is extremely close to the XE274 cam I recomended earlier. The big difference is in lift and the HP difference will be minor.
I remember this article, the build is good, streetable and should be very enjoyable without to much of a radical idle making street driving (Read, slowly through town) a bear but easy enuff for dear ol'ma to drive.
At this cam size, the 318 head would have to be fully ported while a 360 head can machined less. The best 318 hed wold be the last pair of casting available from MoPar.
MoPar did a test with these heads (576 I think were the casting numbers, not the 302's) and found 55 more HP over a360 head on one of there test engines. I don't think you'll find another 55 HP with this combo, but more power should be available.
OH, I read the KB piston number as 167, not the 399 which I think is a domed slug. Not needed in this build. The flat top will do great.