[5.0 Pony]

Hey guys, I have been wanting to build myself a 347 Stroker for my mustang, which is gonna cost me around 1200 for a short block. I was thumbin through my Summit Catalog and they have a set of Roush 200 heads that outflow the TFS heads, which are suppossed to give you 78 hp and 54 ft. lbs of torque. Do u think it would be better to build a 347 or just buy heads for my 302??? I would love to build the 347 and slam the heads on there, but i dont exactly have that much dough, the build up is gonna be a long process. Also, if i upgrade to these heads is there anything else i have to do to my engine??? They have 64cc chambers what would i be looking at for compression?thanks a lot guys