In need of some 273 head education

i didn't want to put alot of money into it, and if i did put something like a 360 stroked or not, i would probably have to change the transmission and would definatly need to change the 7 1/4 rear and those were things that i did not want to get into. I'm just trying to make the dart more reliable and nicer shape than it is currently in so that i have more money to rebuild my 68 Barracuda that will probably have a stroked 360 in it, along with alot of other newer expensive parts. However i did have a 318 block for the barracuda that is ready to be assembled and i think i'm just gonna build that and put that in the dart for now. Hopefully the rear will stay together.