Should I buy a '68 Fastback?

I saw a '68 Fastback for sale in my local newspaper. I haven't seen the car yet, but it kinda intrigued me about having a muscle type car. I'm thinking about taking a look at it, but I have a few concerns.

1. I did a little research, and the engines of '68 that are bigger than the 302 its got are 390 and 428 Cobra Jet. I'd doubt I'd find a 428 Cobra Jet block, so should I put in a 390 in? or stick with the 302...

2. I want a manual transmission, I'm assuming the T5 is the most common choice. What are my transmission options? [Manual wise] I'm willing to shell out cash for a T-56 if it would bolt up to that 390 or even the 302.. anybody have an idea?

I believe that's all I can think of for now.

Actually, after rethinking it a bit.. I'm thinking I'm going to order a crate motor from Ford Racing. *drool* 514 c.u. engine.. way over kill though.

I think I'll go with the 351W.. anybody know where they sell shortblock?

Edit: Nevermind, just found out