Those running Trickflow 190s with a hyd roller

Have a couple of questions for guys running Trickflows with a hydraulic roller cam. I am in process of putting together my La408 and am getting to the rocker arm geometry and pushrod length. Running Hughes engine hyd roller lifters, Trickflow heads with Harland Sharpe 1.6 shaft rockers (the ones Trickflow recommends) and am doing oiling through the pushrods. Looking for those that might have a very similar setup if not the exact same setup. Two questions I have.
1) Did you have to open up the pushrod tunnel on the heads to prevent rubbing?
2) Yes I am going to go through the pushrod length finding process....but a starting point will narrow down my time considerably - those running a similar combo , or the same combo, what pushrod length are you running?
Thanks in advance for the help.