I am currently working with Del's Machine Shop in Sacramento. They aren't race specialists but have been really helpful and easy to work with and patient with my unending questions. Very reasonable too, IMO. For my TR3A, they are turning crank, resizing big end of rods, fitting rod bushings, installing new cyl liners, installing new flywheel starter gear and surfacing flywheel and fitting TR6 pressure plate, surfacing head, valve job with new valves, hardened seats, new guides, springs, restore rocker assembly (send it out), install cam bearings, balance rotating assembly, shot peen rods, head, and block and magnaflux all, fit modern oil seal on crank (remove scroll). I think that's it. For about $1,400 - I supplied nearly all parts except valve seats. They are checking all important dimensions.
They offered to send out head if I was insistent on porting and flow work but they discouraged me. They said that was the least bang for your buck when it came to performance upgrades and I was feeling the pinch of this $3,000 engine rebuild so took their advice.
For head work, why not ship it back to Hap at ACME Speed Shop? Spit head is pretty small, right? I bet he can set up your head as wild as you could possibly want.
Pat