Hi Rich, I still think 450 is pushing it on a 205 block.You cannot long stud the standard 205 block either incase you were thinking of this as it was mentioned somewhere on this thread.
If it's a 0.25 or .5 max you may have a chance. I don't think it will last long on a track slag myself.Before anyone says it yes we all know a handful of owner who have 450 or 500bhp on a 205 block, few have been lucky, most haven't.
I spoke to a few tuners about this last summer,most say go to the 200 block.
I would decide who's gonna map it and what ecu your gonna be using, then get your tuners advise first before you plow your money either way.
I hope this helps a little Rich.
CheeRS.Lee.