Internals wise you want it light, well balanced and stong! If your looking for 400 go 5e as the 4e will be more challenging to get 400 from. socks engine is a racerech built engine so as iddy said race tech are who you need to talk with. they also know drag cars. failing that zisco on tgtt (kieth is also on here through sikillamart) the malta boys from zisco are drag mad and have got serious bits of kit available for drag starlets!! Id strongly suggest speaking with them. Alot of spuddys bits are built by zisco and assembled by east coast customs.