If it got too hot you would already see signs of damage, coolant leaks, blow by, oil smoke out the exhaust that doesn't go away. I think the stock bottom end and that intake are hurting you. Someone will chime in that knows more. Sounds like some carb tuning and timing adjustments are in your future. When i was a kid i fired up my 440 for the first time and i had a geyser of water shooting out the radiator(air pocket) she got up to 230 on the mechanical gauge and i shut her down quick.Beat the crap outta that motor for 6 years, never had problems.