Thanks for keeping the 318! Wise choice :) One thing i will mention is don't forget you can get thinner head gaskets to get that compression up a bit.. not sure on the promaxx or SM chamber size but with trickflows (60cc i believe) i ended up at 155psi on a stock '85 bottom end..
BTW.. what is your end goal for the car? is it just a cruiser for fun? keep it how it is and freshen it.. **** will snowball fast.. i did it to myself.