there's plenty of valve spring compressors on the market. This one is particularly one of the easiest I’ve ever used.
Bluegrass Performance, Dodge Magnum and Chevy LS 1,2 & 3 valve spring tool. Could easily use it with the heads still in the car/truck without issue.
Was about $53 with shipping off EBay. Figured I’d share. I had a set of heads stripped down in about 15 minutes using it this afternoon. Figure enough guys on here have magnum swaps and/or work as mechanics that maybe one of you...
Valve spring tool