Here's some inspiration for your inline 6 build! This guy is running a 250 six in his Chevy Opala, and it runs 11.50's/11.60's in the 1/4 mile. He's running methanol and 15:1 compression though, so his combo isn't daily driver friendly. I'm building a 250 for my '66 and I'm planning on running 13:1 ish with 105 octane E85- its really easy to find around here and cheaper than regular gas. Will be watching to see how your build turns out!
Edit, here's a link I found with some info on his engine. 373 horsepower at the wheels! It must be a later model block with thicker cylinder walls, as most 250's aren't able to be reliably bored to 4" like he's done.
http://www.inliners.org/ubbthreads/u...97b59417542a13