74 worth it?

i found a 74 nova with the inline 6 and a turbo 350 tranny. its a 2 door but the frame is in really bad shape. i was thinking of boxing in the frame to rebuild it and give it more strength. other then that the car is in good shape and runs fine. i was woundering how much hp can i get from the stock motor and what my hp will be after mods are done. i'm going to kill the 6 and then put a 350 in it. what might be the 1/4 mile time stock?

i'm sorry. its a 75.with the inline six.

I have a 74 that had an inline 6... don't waste the money making it fast!! I dropped a 350 in it and it was the best thing I ever did!