Two things on small blocks one is which block are you building, 340 or 360? Many NHRA stock class race cars use "stock" oil pan, mandated by NHRA rules. There are several diffeent versions of oil pans for both blocks, 360 is different than 318 and 340 on the rear main bearing cap size Look around for the deepest stock oil pan you can find with a center sump and then add a slosh, deacceleration, baffle on the front of the pan at the top of the pan where it starts to go down into the sump, you can vary the hieght as needed to clear your crank and rods, put it as high as you can, make sure it sticks out two to four inches and is fitted tight to the oil pan to keep the oil in the sump Don't forget to put a hole in it for the oil dipstick to go through Add a acceleraton baffle also, it needs to be trimmed to clear the oil pick up, that takes time and pateint I use paper first to get it close, trim it until your happy and then transfer it to thin gauge steel and fit them up A good tight fitting crankshaft scraper really helps keep the oil in the pan, same thing on mock up with stiff paper, I use a old gasket package for headers or intake gaskets to cut up for the mock up