the tr tube at the back of the engine needs to be steped back by 25-30mm in the middleabove the bell housing to get the std thermostat housing in at the back of the cyl head.
a simple way of doing this is to make the chassis as book then at the bit before you cut the bit out of the bottom rail for the bell housing tack (20mm welds) at the ends a section of 25mm box behind the top rail between the frontof the trans tunnel 19mm tubes then cut out the middle of the orignal with 45 deg cuts so the orignal is stepped back
i added 3mm packers in mine to get 28mm offset as it looked like i needed a bit more but 25mm would have been ok.
i hope you can get your head around my discription
