need a motor

My number four cyclinder seems to be shot. The plug is covered with oil.
The Car only has 63000 miles on it.

I want to build a new motor. I already have a stock block that has just been bored .30 over.

I dont have alot of money but thought mabe eagle crank and rods to make a 331 but I want to save money on the heads I have a set of 69 351 windors, the stock e7's and, a older set of 302 heads that are ported.
I want to use the summit federal modul rebuild kit for .30 over and 10.13 compresion with a 58cc head. I still have the stock intake throttle body and mas air. where should I invest my money to build a strong combo that I could mabe spray a little juice.

Alright,

If I build the 306 up I am going to use the summit rebuild kit with 10.13 pistons, have the crank and rods gone over, and build up the top end.

I want to port the stock e7s and stuff them with good springs,valves, and a nice set of rockers. Also what cam should I use. Now if I do this what should I mill the heads to and what should I put in them????