The Little Engine That Could

I'm starting the build up of my 65 Cuda it's a 53000 mile 273 2 barrel auto car red in and out. Rough body, interior not too bad, I want to make a hot little street machine out of it and to be able to run Time Attack (solo 1) Here in Canada I'm looking to make 400+HP out of the 273 with 4 gear and around 4:56 out back depending on track. If any thoughts on the engine can you post it in my 400+HP 273 thread link below Please & Thanks, I'll post some pic's soon.