This is where I got my guesstimate of $2500:
Cam = 330
Lifters = 435
Springs = 150
Retainers = 60
Locks = 40
Push rods = 200
Gaskets = 30
Timing set = 70
Rockers = 500 (or more)
Converter = 500 (more or less depending on size, brand, etc)
Machine work on heads (if needed) to accommodate springs ??? 150 ish???
The sum of these parts is $2465...so about $2500, give or take a little...I might be forgetting something, but this should get you close.