Will a 265 kit be enough?

I race in the Vet A classes at Winchester Speedpark in New Hampshire. They have an 11 race spring series and an 11 race fall series. They have both a motocross and supercross track and they run both during the series. This year I won the 35+A and 40+A in the spring and the 25+, 35+ and 40+ in the fall. I ride a 2005 RM250 that use to be a Motoworld Racing team bike. It is very fast but I have a hell of a time on the motocross track against the 450's, it has many long straights and is a very deep harrowed sand/loam mix. I also have a 2004 Motoworld team bike that I use for practice, last years race bike. Do those of you that have one of Eric's big bore 250's really think it is enough. I would like to put one in my 04 RM250 to use for moto next year if it would be enough. I had an 03 CRF450 but went back to two strokes because I think that they are just more fun. So is a 265 going to cut it or should I just bite the bullet and buy a 450 to use for motocross. Sorry for the long post and thanks for any input.

Hey K-9! I just don't like being beat when it is just because I am outbiked. When I'm going down a straight and shifting up three times and a 450 just blows by me like I am standing still, I know it is the bike and not me. I love my bikes but would kill for one of my old 500's for moto. I would never sell all my 250's. I love em for supercross but if a 265 would even the score, even cut the difference in half, I would go for one in a second for moto. Half my problem is that when there are a ton of 450's at the start I end up starting mid pack and have to work up to the front. By the time I am there the race is over. I would kill for 20+2 motos instead of 4 or 5 laps. Anyone out there have a RM265 that can share their experience??

The more I think of it I think is worth a try. My current cylinder and head on my 04 have been done by Bill's Pipes and is very strong. Anyone know if that will mess up Eric when he does the bigbore and porting? It has a v-force 2, Bill's pipe and shorty silencer. It is supposed to be an outdoor motor but my 05 FMF built Motoworld race bike was supposed to be an arenacross bike but seems to pull longer in each gear. I wish Suzuki would come out with an RM400 2-stroke based on the 250. I would love to have a Service Honda CR500 but I pay less than as stock bike for my race bikes and couldn't justify the cost. I'd have to sell all 3 of my RM's to afford to buy one Service Honda CR500. Thanks for your input guys I'll let you know when I get the 265 kit and whatI think of it. I hope to get it before I go down to Aonia Pass over Christmas vacation, if I can get to Eric and back before then.