Roller Block with Magnum heads???

QUOTEMy goals are to build a small block between 325 and 375 hp.
I have a roller block out of a 1990 Ram 3/4 ton and magnum heads out of a 1993 Dakota.
this will be going into a 1968 barracuda hooked up to a 904 with a 3.55 - 8.75 rear/741 carrier.
should be a sweet cruiser.
So I am trying to work with what I got... But if building this magnum head with a roller block would prove to be unnecessarily difficult I'll just look for a 360 non roller engine to build. Currently the car has a 1972 318 block with 1965 273 heads.

Building it should be easy as an LA.
325 - 375 is a huge 50 hp spread. Unlike 1,025 & 1,050.

3.55’s?
Hyd. roller cam?
Try this very sweet cam;