I have modded stock timing plates,if you slot the holes to were the washer on the top bolt of the timing plate is even with the left edge of the plate that is real close to +4deg.You can get plates for not much money and then you know exactly were you are at and you can play with your timing if you want.I like more timing and slightly less compression.
Hit up one of the site sponsers for the pods,with your motor the smaller ones should be good.6 inch ones.
You can get your head shaved .035 and still be safe for 93 octane.You can have your head shaved and get it rechamberd to 19cc domes and run race fuel and still be all stock looking.Around 160psi at sea level is were you need race fuel.
Since you are running the Vito's power pistons then you should not run ported cylinders with them,the pistions simulate a port job.
Those R-2 pipes sound like a good pipe but i have never been around them.T-5s are a good pipe for what you want, but CPI,Vito Fat Bastards,Shearer,and Rockets are Great top end pipes.Also i see that Jim at Passion Racing is making a new inframe pipe called Snipers.Alot to choose from.
Some 35mm carbs would also be a nice add on, or get the stock ones cut to 28mm if you want to stay with the stock style carb.