I just did everything you are going to do in my 67. I went with the "Prothane" poly engine and tranny mounts from Summit for around $130 total, works great. Unless you have a reason to need the adjustment, I wouldn't worry about it. Just research the heck out of your components and likely you'll be fine. I did FPA headers, TCP R&P, AOD, X-pipe exh. sys, Milodon oil pan. I did have to dimple one header tube to clear one corner of the engine mount but no big deal.