Ive got a 78 f150 that had a 351m/c6 stock. Swapped in a 460/t-18 from an 85 f250. The bellhousing was for hydro clutch. I got all the stock 70s clutch linkage and its installed correctly. I cut the slave cyle mount off the bellhousing and just put the clutch rod to it like it would be on a stock 78. Now when i push in on the clutch it is stiff enough to make the firewall pop. Anyone got any ideas what the hell the problem is? Clutch kit is new. It was all installed the correct way and the engine slid right into place. Didnt have to force anything together and it lined right up on the input shaft. Would the pressure plate for a hydro clutch be stiffer that a manual clutch maybe?