If I were selling such an engine for $1100, I would be willng to spend 1-2 hours disassembling with you to inspect to your satisfaction. Not to measure every component, but to make general the assessment that things had been been machined and were still untarnished (that it was not a junkyard rebuild).

Provided, of course, that you assured to me first that you were a serious buyer and that if the engine were found to be acceptable inside that you'd hand over the full $1100 (or a close amount agreed to beforehand).

If it appears to be a good build with some performance parts inside, try spending $1100 on a fresh build and see how far it goes. I'd rather have an $1100 383 than a $3300 440.