Last pic is old overhead system & how we oiled the 487 along with a Peterson wet/vac pump . The rear feed was switched from out of the back to # 5 main . An external balance line ( -6 )from off the oil filter outlet to back of block . We had a main external Manifold feeding -6 to rear , -8 to oil sending front -12 to front of engine passing under Intake into a -8 the Three way manifold Block . New manifold full is -12 under intake & will & should support 3 center mains & exit to rear of the lifter valley to stabilize #5 main & 8 rod Mind you we run a 3/4 bearing with 2 extra holes & channeled mains New SRE Dry sump pan & a dry sump Daily pump. This has been a modification & discussion that has not been up dated or died . Or at least I haven't read or seen in a long time . Maybe the moderators can merge this with the old thread or make a sticky ? There was a lot of good information about Keeping the BBB alive in the old post . For those die-hards who still run a serious 455 Iron race engine , here is the oiling & modifying that we do & has not been discussed in a long time lol . Hence the release & most upgrading to the TA Tomahawk.