5.7 / 6.1 location preference?

Re - Motor forward. - I'm gonna take a guess that the reason you would prefer the motor to be forward is not because of the "front/back" position on the K frame - but actually that the motor is on a significant tilt at the front, thus "crowding" the firewall?

I have just experienced the same issue...and its down to the TTI adapters.

Check it out and let us know if its the same case with yours.

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As far as creating more room from the right inner guard, removing .5" from your drivers side TTI adapter height will both drop and centre the motor.

Get back to us on the "tilt" issue.

PS - FWIW I didn't need to use a bell housing adapter plate..once the TTI adapter mounts were "massaged" into providing a decent location.