I like something like these , but I'd rather they be Fel-Pro. https://www.ebay.com/itm/SBC-Steel-C...xWoVjb&vxp=mtr

The long hold downs are great for steel stamped valve covers but are not needed for aluminum. Getting the mating surfaces totally free of any grease or oil is a must. A well ventilated area, rubber gloves, an old rag and brake parts cleaner works great and leaves no residue.