One more vote for the Power Packs.

You need torque and crisp response not lots of R's, especially with a 2.73 ratio. The smaller valves will help with that.

I've run a 283 in the past and loved it.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...