I've had great experiences buying through Mancini. They were invaluable during the last build with lots of last second parts runs.

I bought my Eddie heads from them probably four or five months before Edelbrock severely dropped the price. Was a difference of $300 if I had waited - I was pissed. Mancini was under no obligation to do anything for me, but still offered me a fair amount of store credit. Promptly used it to buy more odds and ends. Hell, they've even let me borrow tools in the past.

Place has been great to me in my experience.