318 with random parts.
I've used those same dumbell lifters in bigger cMs and they still work fine. Ever hear a 273 purring along with the machine sound going on under the valve covers? Solid lifter 318 sounds just the same...matter of fact I took everything off a spun rod bearing 273 4bbl and put it all into a 68 318 short block. Cam, lifters, heads, distributor, intake, exhaust...and it sure felt to me that it made more power than the 273-4, lower compression (?) and all. Imagine what a matched cam to those pistons could have done.