anyone use a comp roller cam and lifters in LA small block

Are you asking about solid or hydraulic rollers.
As far as direct drop in. No way in hell were the comp hyd. rollers going to fit in my 360 roller block. The valley needed to be ground to clear the tie bar on the "Drop in Retro-fit Rollers". Of course the short block was already put together. Disassembly to grind, rewash and re-assemble was out of the question for me when alternatives were available. I ended up getting the stock MP rollers, spiders and dogbones.

How is that setup working. I'm in the process of assembling a factory roller block with a Comp XE hydraulic roller (280HR or 286HR) and I'm going to be using the factory lifters and retaining hardware. I have been told that I can expect to have issues between 5 and 6,000 rpm, as the stock goodies weren't intended to rev that high. I'm stubborn enough to have to see it for myself though. What about pushrod length, are the stocker gonna work?