What year car and body style and the same on which year Hemi oil pan?If a 1970/71 426 hemi and 440 6 pak oil pan they work great on the 1966 to 1971 B bodys and E bodys, if you slide the BB motors back one inch in the A bodys and trim the K member a little they work great in them also
BTW, what stroke and rod size are you using? If Mopar rod size and 4.250 or longer stroke you may and probally will have crankshaft and rod to windage tray problems
I had a bunch of billet aluminum 1/4 inch thick oil pan spacers made several years back for this application, I have some of them in stock still for sale
If your using a crank with 2.200 (BB Chevy size)or smaller rod journals and steel rods you will be fine with a 4.250 stroke cranks or shorter except for the oil pump boss, it will need some, not a bunch
, material ground off of it for clearances
As far as a high volume oil pump I use them all the time with both years stock hemi oil pans with no problems at all as long as I keep the oil level between the full mark and the add one quart mark on calibrated dipsticks
I use the stock 3/8 inch 440 oil pickups also
I have all my cams grooved on all my roller cam motors
to oil the rockers full time to help cool the valve springs that aren't using the Indy heads
I do cut the oil pump bypass spring down so the motor will have 10 lbs. of oil pressure for each thousand RPM with hot oil, IE shift at 7000 RPM with 70 lbs oil pressure with hot oil
IHTHS