Here is my story on filled blocks for lake boats.
I ran a 440 more most of the summer. oil pan holds 13qt. and have a oil temp guage. I could hold it wfo for over a min. and the oil temp would only climb to 240ºf-250ºf. Or tow a tube or skier for as long as i want and only saw 210º-220º I drop a valve in that motor so I installed a 383 that I had did a half fill on it. The oil temp would climb fast. I could only tow a skier or tube for 15 mins befor the guage would see 280º-290º
If you do run a cooler!!! and a temp guage.