Sure, I'll take a bite as this one. Cam specs sound good, I would tighten up the lash regardless. I always run lash between .023" - .026" on any roller, larger lash numbers make me nervous (anything exceeding .028" & up). Switching over to the tunnel ram should inherently make a few extra HP numbers just by increasing the plenum area and moving the venturi(s) directly over the port will increase the effecientcy of the induction system. Because of the increase in plenum area the engine will obviously want more fuel, signal and response could be effected minimally but in your application it's not a factor. Moving in two 1150's will be a great choice. You should see the peak numbers move up in the RPM range but overall I would suspect that you could see another 15-20HP and 8-10Ft/Lbs. What linkage?....I use Enderle's 2X4 tunnel ram linkage on my engines and I think it's by far the best kit on the market.