Hello Folks,

I am new to the forum and have some general questions. I have had past experience with small block fords and I am now going to venture into the FE world.

I would like to build a 390 for eventual use in a 67 Mustang. I have been looking at the availbel blocks on ebay and see some have an X in the lifter valley and some that are identified as a GT block.

So, what does the X signify and is there in fact a distinct "GT" block?

If so, what is the difference between a GT and non-GT block?

What is a reasonable price for standard bore 390 blocks?

If possible I would also like to find a block as close to the date of manufacture for my Mustang and a block from a mustang.

Is the correct casting code for a mustang "z"?
Would Mustangs have had "A" codes?

Any thing special I should look for? General advice for someone new to the FE world?

Thanks in advance for your time and advice and happy new year!!

Mack