What Engine Kit is better for drag racing?

I raced with some semi-tricked out banshees today and I got burned really bad. I was wondering which engine kit would be a good one to get for drag racing, but would also be reliable. Or, what setup do you think would be good for drag racing?

ESR 370 kit

LRD 350 powervalve kit

MP Racing Polonda 390 kit, Polaris cylinder machined to fit a 250R bottom end, can be bored up to a 440, I think

CT 410 kit

Thanks,
AirManDan

1986/1988 TRX250R, 1988 Engine and Swing Arm, 1986 Frame, bored 40 over, V-Force Reeds, ESR TRX-6 Pipe, ESR Silencer, Keihen 36mm carb, Sidewinder Sprockets, Hinson Clutch Basket, K&N air filter, Nac's Case Saver, TM Designs Chain Slider, Renthal Handlebars, CR250 Clutch lever and Perch, Lonestar Supertwin bearing carrier, Pro Design Kill Switch, Pro Design Power Shifter, Shredders all around on Douglas red labels, and a Clarke 4 gallon tank. Just bought some GBC Sand Devil Paddles on ITP rims.

Future Mods: The NEW Shiny Orange or Silver Maier plastic, new seat, Roll Design Steering stem, RPM Dominator +4 axle, RPM Hubs, Roll Design +2+1 a-arms, and some new front tires with some ITP rims.

[Chef]

Mac Racing 500R. CR500 head on 250R bottom end.

proably ther most epensive, rare one avalible

[Chef]

the Mac is $2700 I think...but it is the fastest one out there...Like turn you to the right from torque...

How can I contact the maker of Mac Engine kits or what is their webpage?

AirManDan

[SandTrix]

Best bang for your buck would be a true 250cc on alky. This would surprise alot people and you wouldnt have that much money invested at all. I have a true 250 that runs right with my ESR 350 motors. So with the right parts/tunerand the right port job you could make a sleeper motor at least. But if you want to try and be king of the Rs you better go with most likely a stroker polonda.