If your budget is tight, you might just install the crate as it is. Then, if you really need more power, start with the upgrades.

I put the exact same crate in my 69 Camaro recently. I was considering putting in a roller cam and rockers before I dropped it in, but some other unexpected expenditures came up. Sometimes, I wish there was more power, but I bet I would be saying the same thing even if I could have afforded the 502 Ramjet. With gas prices as they are, I'm glad I didn't put in the higher performance parts.