360 Dodge
Here is a picture of a Magnum engine with the “Spider” that holds down the tappets. The lifters are independent and use a link bar that rides on the lifter directly. The lifter has flat surfaces and the oiling hole of the lifter should point towards the camshaft when installed.
The use of a Hyd. roller cam is an easy bolt in. The Hyd. lifters should be an OE unless your doing a very high performance or race engine. The OEM lifters are cheap.
FWIW, the timing cover, water pump and if it had a mechanical fuel pump are made of aluminum. Nice and light weight.