For all the unimportant reasons I chose a 327 to install in my 47 International build. I have a question about heads. When I got it back from the rebuild shop, I started assembling the important things on the block, like the polished alum alternator, ps pump, ac compressor, intake and Edlebrock 600cfm carb. After I found tdc and installed the Mallory distributor, I tried to install the spark plugs I bought for the 69 Camaro 327 engine I am working on...no fit. I pulled the valve covers and got the casting number to search on Google. I found out that I have 350 heads from the 70-80's. The only difference I could find was that they have slightly larger intake valves than the stock 327 from 69. The only change to the 327 is a stage 1 cam addition and the 4 bbl carb & intake.
Is there any advantage to having these heads over the stock 69 327 ones?