i'm sorry but what the hell is wrong with olds,i have a 1973 (smogger year) 350 olds making 402 engine horsepower/500 torque,so you cant sit here and say oldsmobile never had performance cars.This engine was in an 86 cutlass drag/street car,gutted interior,3.42 posi rear and slicks and it ran 11's flat.Chevy isnt that only car maker in the world either,yes oldsmobile engines will be expensive for parts and build wise but hell, its an oldsmobile car so it should be an olds engine right?In the 50s olds had the rocket v8 appear,making nowhere as much power as say a 1970 442 with a 455 OLDS v8.Oldsmobile had a great performance margin through the sixties and seventies and they had good reliable engines,very durable.Oldsmobile added nickel content to the iron in the blocks which makes them built to a higher quality.You also cant say a 455 stock isnt a good performance engine in a g unless you're a damn idiot,nonetheless a built up 455...Now a 307 on the other hand aint worth jack sh*t,90 rear wheel horsepower is imbarrassing,especially with 2.something gears,and yes a 307 can produce 435 engine horsepower,but expect to pay out of the *ss,i think it'd be very unique,but going with a 330-455 olds is cheaper than modifying a 145 horsepower 307.My cutlass salon had a rebuilt 307,making 200 horsepower with it being bored 40 over and having a spruced up dui ignition,ported heads and a richer ccc qjet,but why spend that money on a 307.For 200 horsepower,expect to pay,having one built up for 435 horsepower,dream on.