If it was me I'd go with a 4.25 stroke and a 4.500 bore , thats a 540". You might consider using cast iron merlin cyl heads as they hold a head gasket better than aluminum. your best choice for a blower would be a screw blower like a PSI or a Whipple. Blown gas is dominated by turbo"s for a reason , blowers make alote of heat on gas and are hard to get the tune right for the long end of the coarse. The screw blowers make alote less heat and as previously mentioned , the bigger the better so you dont have to overdrive by much. The bigger the cubes , the more overdrive you need to make the same boost , and more heat. Good luck , its the hardest tuneup on the salt.
