70 dart 470 ci drag car build.

Tim and I spent a couple hours breaking in my engine, for the most part it went well except for a massive vacuum leak at the top of the intake runners at the head. There's a gap I didn't notice when I put the thing on, also the plenum gaskets squirted out lol, so it's back to surfacer and start over......but when we were breaking in the pistons we gave it a few real good revs and it hit 7000 with ease and it never did that before.