You might not wanna put some work into it, but we used to run dirt race cars. 355 cube rule and 512 lift rule. What we did with a motor at the beginning of a season was build a 331 stroker, the 350 crank dropped right in, only diff being the berrings. And I said 355 rule, well I could point out 5 guys running 400's, but track politics wouldn't DQ them . BUT After spending weeks in the tech lane after winning a few features or at least coming in the top 3 and being on top of points they were amazed at what the numbers were coming up as. I even got a cuber for free after they threw it away thinking it was wrong. You would be surprised what you can do with one. Wouldn't you rather beat a 350 saying it's only a 307.... a little more pride in that, I know I get bigger smiles from doing this then knowing I out match someones motors cubes.