old falcon fan

i am about to start reconditioning a 1976 xb fairmont
i have a 302 block from an xc in the shed and a 351 motor in the old car now (its a 72 engine i cont use it)
i plan to make one moter out of 2, i have a crane cams electronic ignition system with a supercoil, i was thinking of shaving the heads and useing a stage 3 heatseeker cam, i have a 650 holly i think (i know it is big), running a toploader box with a standerd 292 diff
does this make since? the car has a 250 non crossflow now i know the main changes i need to make and do i need to buy i v8 power steering pump?
but i need to use the 302 block

old falcon fan

i also have a set of open chamber head and a set or closed chamer heads......what shoud i use i am thinking closed chamber heads. i also dont know what is on the 351