Which 13.5 BL motor for Touring Cars??

[DerbyDan]

So... i'm currently running my touring car in the pro 13.5 class (advance speedos allowed) at the various clubs that i'm racing at the moment. I've got a Black Diamond speedo currently driving an ageing Hacker motor. The Hacker is notorious for being torquey but not for outright rpms so i'm finding that i'm starting to loose out against the quicker guys in terms of outright speed.

I race mostly at Kettering & Milton Keynes (both fairly small tracks) & Hinckley (quite a bit bigger) & I would like to have a go around Moto Arena... which is huge... what motor would you guys go for, & what is 'hot' at the moment?

Thanks

Dan