I had a 283 punched 30/1000 that came out of a Corvette that lived in my 34 Ford 5 window coupe. Highly modded it turned in the low 13's in the 1/4 mile. Not too amazing by todays standards but I have an attic full of trophys for the "D" gas class that I ran. The SBCs were cheap to get HP out of as parts were plentiful. I now have a 66 Mustang fastback with a numbers correct 289 Hipo. It seems to be a smaller engine sizewise but makes decent HP for what it is and considering that the correct gasoline is now $5.00 gallon, it doesn't see much activity now. Both engines make a good amount of HP for their size. Both have great records in being semi-indestructable. Either one is a major trip to work on, that is, if you like working on engines. The 289 will rap faster than a SBC but the SBC is easier to get more cheap power out of it. I don't think either one tops the other.