I would suggest something 235'-245" on the wheelbase and make sure that you invest in the wing for the car as well. I highly recommend a swingarm suspension and for your application I would consider something with 2 shocks versus a mono shock if you are going to be a 1200 HP player with that motor. I would always recommend a call to Russ at RaceTech for a good conversation on chassis as I am more than pleased with what Russ gives us. However, being in Florida, a call to Kurt at Undercover would be a good choice.
As for your gearing, converter and other factors, that will have to be determined on your final choice for your motor combo. You are probably looking at a 34.5 tire. I like the Hoosier but you will get multiple opinions on which are faster or which have more/less shake.