Keeping that 350 cool with the original radiator is going to be a challenge. You'll need to get it recored with a unit that will stand at least 15 pounds of pressure. Ditto on the heater core. The original core won't stand that kind of strain!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!