Hi,

I have a 68 GT convertible 4-speed Mustang originally an S code 390 but now with a 302 with cracked block. It has been parked for 20 years. I am looking for a good used block to rebuild. I understand I need to find a 4V 390/428 block to do this. Is the best bet to call junkyards? What range of years would work and how many ford models had the 4V 390/428? Not a lot of money to work with. I used to do some motor rebuilding about 25 years ago.

Any suggestions on good rebuild manuals?
Thanks,

Rob