Well, I would get a nice set of ENGINE PRO valves, bronze guide liners, hardened seats on the exhaust and some viton positive seals to go with the cutting down and machining the guides to .530, do some porting , then cc and mill/correct if necessary to the desired chamber volume.
Intake port-Finding the peak [tallest part/beginning of the short turn] and just roll it around towards the seat but don't touch the VJ angles.
The push rod pinch should to be ground straight and the rest of the wall blended into the bowl. the roof and guide boss kink can be ground higher and more smoothly turn down into the bowl. The guides can be skinny'd up quite a bit, keep the guide long with an edge at the beginning then rolled/roundish the last 3rd towards the V stem.
The exhaust guide can be ground out completely,,but leave some right above the ssr then go up to the kink that can be straightened out a bit too .You can feel through the freeze plug hole on each end port to gauge with your fingers, you can take around .080 out. Then short turn just wants to roll a hair off the seat then straight up and just 'slightly' rolled/lipped at the top. Polish the crap out of the exhaust port if you'd like..itll fend off carbon build up
Just some advice.
have fun