What did u do for the hydroboost? I am working on a '97 Tahoe right now with an '89 cummins but the Tahoe has a booster so the brakes will work out. Using the autoworld motormounts also, but body is off right now so just hoping the engine placement is right. We are using 2.5 ton axles so can't help with the starter and diff problem. ALso got the alternator and a/c brackets coming soon too. Sorry not much help, not using the speedo either. Which tranny are u running? CHeck out Monster Transmission & Performance | 800-708-0087 | Fast FREE Shipping!
to see if they have an adapter for the speedo. I know they have one for a cable speedo to an electric speedo using both chevys, but not sure if they will have a conversion item like that. Check out destroked.com also for a speedo solution.