318 oil pressure

Awhile back my 318la (87 truck block) jumped a timing chain, and bent 9 pushrods. The old pushrods were the oil thru type, the rockers have the drain holes for them aswell. Needed a set quick and the local parts house had factory length mellings, but they didnt not have the oil holes in them. Ran them anyway and its definitely alot less noisy than the old bent PR's, but the oil pressure is off. On the old bent pushrods, it would have 60psi on a cold start, and 35 at hot idle on any given day, idle @800 or so. With the new pushrods, it gets 50 on a cold start on a cooler day, 45 on a warm day, and at the absolute lowest, 15psi hot idle, idling around 500 according to the tach. I'm aware that this is a low idle but this thing has a little rear end play and likes to bang into gear from drive to reverse or vice versa when the idle is set to 800-850. Tach is running off of the output plug on my MSD, oil pressure gauge is a mechanical parts house gauge. The only noise I ever hear it make is what I would call a combination of the double roller chain, and general belt/pulley noise, no tapping or major signs of oil starvation. Just curious as to whether this should raise any alarm or not. TIA

Edit: Forgot to say but i'm running 10w40 conventional and have been since I got it.