if it is a 911/930 body i would suggest that you remove the dash cap and cover all the holes in the dash and replace the cap. seal all other opening to the trunk. and most importantly fabricate a false firewall between the radiator and the gas tank sealed to the sides of the trunk[inner fenders} and with a rubber seal to the hood when closed. takes a little time but well worth the effort.. this is my 930 with a mast motorsports ls7. the radiator was built by griffin to my dimensions which were about as large as i could have it built and fit in the available area, good luck
