Thanks man! That's a huge help. If I touch the ports at all, I will go easy as you say. I have a good set of carbide burrs that I use for general fab stuff, but they will go thru cast like butter.I ordered them from Summit, there are the 062’s. I pulled the rocker arm studs using washers & a nut. Bought one of those rocker stud alinement tools for screw in studs. Somehow I got a couple of studs not inline with the others, leaning towards the valve a dergree or two. So be aware if you use the same alinement tool. First Let Me Say I’m not a professional at porting!!! but I did a boatload of homework before I started. I didn’t have a air grinder at the time so I used my rotozip. A Dremel tool takes to long & won’t have the reach you’ll need. Ended up buying an air grinder and a couple of 1/4 x 6” rotary files & a few 1/4 x 2 1/2” files. I’ve seen those porting kits that are rolls of sand paper. There good for polishing not for a full port job. Rotary files cut or grind cast iron pretty fast so you have to be careful. You can’t be forceful, heavy handed etc. Just light touches moving side to side. The roof or top of the runners don’t need any work. The short side bend & the floor or bottom of the runners require most of the grinding & on Vortec’s you don’t need to remove very much. Don’t polish the runners, leave them a rough surface. You can polish the chambers. I did use the Dremel for this, used some thick rubber disc with grit infused in the rubber, worked great.
Enough of that, porting.
Engine is a 350 bored 40 over, sadly it’s a 2 bolt main with ARP bolts. I was using the original 1978 crankshaft but worried about it’s age and bought a new Eagle cast crank. Wasn’t planning on spinning a 2 bolt main block really fast. 6” SCAT rods which let me use lighter DSS forged pistons. Howard’s roller cam, 266/270 Dur@050 213/217 lift .485/495 110 LC I wanted a cam that started sooner in the rpm range. It comes on cam about 3300 rpm’s, hits pretty hard but it does fall off about 5800 rpm’s. That’s about 130 mph in 4th gear, good enough for me. Lunati roller lifters. 750 Eddy carb on a Eddy Performer intake for Vortec heads 2116. An a regular no frills HEI distributor. 700r4 transmission & 3.42‘s in the rear.
Sounds like you have a great combo. Absolutely nothing wrong with a 2 bolt. I'm using the complete stock vortec 350 bottom end on this one and it's a 2 bolt.