I've been running hydraulic rollers in FEs for quite a while - Comp used me as a development and marketing lead - we've about 22 grinds listed so far - not sure how many will hit the Comp catalog. Good parts for street runners, but a solid will still outperform them.

Factory solid lifter 427s had no oiling through the lifters - so any hydraulic will not work. The adjustable rockers are a must with solids and a darn good idea for hydraulics. I have done hydraulic rollers using non-adjustables and custom length pushrods - but its not an easy deal - you want to measure every valve for pushrod length since you have no adjustment capability...

You will not have any oiling problems with minor mods - nothing exotic.

If you're gonna stroke it you ought to consider going with a longer stroke - same cost and more cubes is always a winning deal. When we dyno the 445 inch versions we'll normally see 450-500HP and always hit 500TQ.