I would get with Jay760 and build the motor around his combination as it seems to run real strong. You'll need to install bronze guides to prevent seizing or galling of the valves stems,iron guides are a no no in this type of racing and i would'nt use a guide seal on the exhaust guide either,you'll want all the oiling that guide can receive for lubrication,but thats my opinion. As for the port work the intake is fine but me personally I would work the exhaust port differently in getting the E to I flow ratio down to around 70 to 75% to prevent over scavenging but again that's my opinion cuz if you get that port right it'll flow big time right with the intake at certain lifts. Anyway I hope it all comes together with that 250-30 for you.
I’ll contact Jay760 and ask his advice, cheers Jack!
Where can I source bronze guides???
So the usual port work on the intakes but different work on the exhausts to what you’ve re-posted so far?
I have a bare cylinder head arriving this week, shall I take photos of the ports as they look?
Thank you for your continued help, I’m really beginning my journey with making my motor ‘racey’ and I want to absorb as much info’ as I can from everywhere I can!
Daniel.