HELP Didn't fit! My SBC to BBC swap.

[68_chop_top]

I have read this site for a number of years. Built my 68 chop top. Started with no motor or tranny. Found a 68 327 block and went from there. A 5 speed TKO runs great. Got the bug for a big block and started collecting parts and reading up. I was told there are two kind of frames. An automatic tranny and a manual tranny frame. I was sure I had the manual frame so I went with the TKO 5 speed. Had to get the correct bell housing with mounts to fit the cross member. The engine and tranny make up a four point cradle.
So when I was thinking on big block, the bell housing fits the engine and made up the rear mount. Bought big block motor towers from someone off this site. Bolted to the motor and to the frame using the rear two holes and crossover hole. Thought everything was set so I grabbed a head for the driver's side and NO GO. The head hits the cab fire wall where the gas pedal mounts to and the clutch rod comes through the wall.
How can I use the forward two holes with the bell housing anchored in the rear?
I thought I had done my homework and now I am grounded!
Someone please tell me where I went wrong.
Thanks in advance for your time.