1966 c-10 v-8 mounts

[Breadtruck from Hell]

Installing a 383 in my 66 Panel,been off the road since 1997, I threw away the engine mounts years ago. I had a 350 in it,was pulled out in 1997 so no mounts to match for new ones. so I figured I must have had 6 cylinder mounts on it as the mount pedestals have only 1 hole on the flat surface. The engine I now have is about 450 horse so I got the aftermarket pedestals for regular mounts with the long bolt sideways. they were a ***** to install had to actually drill new bolt holes in the frame. The engine now tilts upward looks like a altered, doesnt look right. I am concerned and have not driven it yet.Has anyone had a similar issue? Thanks for any comments,Paul