I believe you can use the LS valves. They have 8MM stems. When you install valve guides get the ones for an 8 MM valve stem diameter. Smaller diameter than stock 11/32, should flow a bit more also. Just check valve lengths to be sure. Just a suggestion BTW. Should be cheap, they are the most popular valves out there now IMO.
On your con rods, you would want to side grind/polish the forge lines so they are smooth. Then have them shot peened & then magnafluxed
1 Weigh each connecting rod and note the weight. They will be very close in most cases, but not exact. Determine the lightest connecting rod and begin removing the casting lines on each side of the rod with a grinder. Use a course-grit stone and work vertically along the seams.
2 Change stone grit to medium and continue to work on the rod, reaching a smoother finish. Work in one, vertical direction along each side, finally using a fine-grit stone to finish the machine grinding. Completely finish the mechanical sanding on the lightest rod. Weigh the finished product and use this weight as a benchmark for all the other rod weights.
I usually use a carbide burr,( just watch out for the sharp burrs flying) then finish w/sanding drums or sandpaper flapper roll.
