ok here is my 2 cents.
The 360 ports are larger then the 318 by a bit. I would much rather port the 318 head then put the 360 head on but understand the "run what you brung" kinda mentality. well i get it.
So you're set. it's going to be a 318 with 360 heads.................I would probably shave enough to get the same compression you have now. why? because if you build more compression then you had before, it could colaptes your piston rings causing it to smoke......o boy this is going to be a long post!
I had a 73 barracuda with a 318 and a auto. put a better cam shaft in it and it ran much better(along with a set of header.) The problem was that when you revved it up it would pore out a haze of oil. It was the best way to get some one off my ***! 2.76 rear end gears equaled 3000 rpm in 2nt gear. Ride may *** and i will turn on the smoke machine:D
Any ways, it had a lot of miles on it. any ways......
with the 360 ports i would NOT open up the bowl on the exh side! i would clean up the roof area, and leave it at that.
Open up the bowl area on the intake side, but not a lot! What "318willrun" show in his video, in that first minute on the intake. that's as far as i would go. next look in the port and fix all the imperfection in the casting of the port. and stop there. Make sure the guide are not to bad, install new valve seals and call it a day.
the reason i say this, is it is REAL EASY TO GET CARRIED AWAY once you start porting. and remember, where you enlarged it here to fix, this that or the other......... now you have to go back and do the same to the ports you were already done with.
Just a light clean up to all the intake ports, then you will be more proficient at the porting tools and can get a little bit more precise.
Remember, You Nick that "SEAT".....Now you have to do a valve job on the head......More dollar signs, then you might as well put guide in it......might as well put hardened exh seat in while you at it.........and it goes on and on and on. But i'm going to stop here:)
