No ptv problems.
Pistons are stock.
Your on the right track with doing things all at once. If you go with the trickflows you'll be on a back order list. I ordered them and mean while saved for cams and they arrived around the same time. And installed them at the same time. Thats cheaper than paying for two seperate installs. I just paid the guy to time it right. Side note: make sure whom ever does this knows there shi** when it comes to timimg. And recommend still you got the heart open you install some studs to replace factory cylinder bolts.
The comp 270 is a good duration for my taste and is a perfect on these fully dressed heads. Meaning I didnt have to buy new springs and clearance is good.
Either way guy good luck.