340 lifter bores bushed or not ?? Solid Roller cam

do they make any drop in mech roller lifters for a 340 no work needed on the block ?
Yes, a few.
But I think people are particular or are sold on this or that...be it lifter wheel diameter or brand or the latest greatest.
I use Morel , the ones with the shallow oil band and feed holes to dump oil on the wheel/bearings, they drop in and cost 300 something. They are street rollers not meant for 550+lbs... I run them 220 seat and 475 open w/.575 roller. No failures so far.
The lifter bores need to be in good shape.
For instance if you've already rebuilt the block two or three times and you're at 40 or 60 over chances are the lifter bores are probably worn out first solid roller lifters without being bushed...and then there is the factory counter sink...too deep and you bleed off oil psi at or around max lift.