Yes it can be done.Small intake valve 350 heads work on a 307 or 305.
Not all 350 heads had the larger 1.94 intake valves.
I read your other thread about what a slow pig this thing is.
Regardless whether it's a 307 or 350, it can be tuned to run well as long as the internals are in good shape such as a good timing chain, good valve springs, good distributor, good camshaft with no flat lobes, etc.
It would help to get that casting number off of the back using a mirror to know where to start the correct tune on this thing.