I was out of the loop on this thread for a while ,reading up on your progress and noticed a good bit has been accomplished.The only one thing I havent seen is the mentioning of your heatshields ,its a little washer that sits down in the injecter chamber ,youll need to pull those with a stick magnet before you do your compression test ,also buy new ones when putting everything back.If it runs bad on start up then idles out after warm up its most likely old injectors spitting fuel when cold then spraying better when warm.To address your question on your vac pump,Sounds like your vps working great.