I built a 514 in 1992. CJ block, iron CJ heads, alum. rods, reground stock crank, roller cam,Victor intake w/ an out-of-the-box 1050. It ran 5.90's in my 2800 lb 69 Mustang. Sold the engine in 2001 and have been doing freshen-ups for the new owner. Just tweaking on it through the years, it's now a 521 and went 5.82 a couple weeks ago in a 2800+ lb 73 Mustang. There is no telling how many hundreds of passes this engine has on it. I put almost a thousand passes on it the first three years I owned it.
The same engine went 5.60's in the 98 mustang in my avatar.
If you want to do it once and do it right, go ahead and get an aftermarket block, good crank and rods to start with.
Last edited by BigDave65; 11-10-2010 at 09:15 AM.