True story...not trying to make 500+ hp so you are correct..9-1 would be just fine..have seen a 440 with 8.69 comp and a 562-300 solid cam work good on pump gas,had ported/milled 906's[77cc]...030..2266 pistons .154 in the hole,team g intake 850 dp in a 69 4spd dart with 4.10's and driving normal got 10mpg on 89 pump gas very responsive and never a ping...just hard to stop...lol