For Quickie Rat, the front rotor baffle piston K&B 40 is the one to beat. If you have a particularly good rear rotor engine, simply install the piston/cylinder/case section in a front rotor engine.
As for Goodyear, AMA Goodyear is almost dead. Judging by where you live, you will probably come here to Dallas to race, so look at our Sportsman Goodyear rules on dmaa-1902.org. Either the Fox or the ST 15 would be legal, provided they are unmodified. If you are looking to start anew, get the ASP 15 from hobbypartz.com for $43.40. Free shipping over $50, so buy two! I sell venturis and needle assemblies for these engines that meet our rules.
I invite you to our contest this weekend in Dallas. We are having racing on Saturday 10/11, carrier on Sunday 10/12, and speed all weekend. A flyer is also on the DMAA web site.
Bill Bischoff