I am still trying to finish up my 355 swap into my 86 TA.. I ordered a egr block off plate for the back end of the intake, but the bolts are the wrong size.. I am workin with a tpi vortec intake. At any rate I need to know the thread size on that particular intake. If anyone knows or can direct me to where to go... I would greatly appreciate it. The Scoggin Dickey website has nothin and u know there techs are just as intelligent as the website. Help please!