I put a rake on my 64 by installing Monroe Load levelers and heavier springs. Then I installed 225 R60 tires up front and 255R70 in the rear. IMHO it is perfect. Looks cool, rides nice and has stock spindles. The other reason for the big tures in the rear (291/2" tall) was to
"kill" my rear ratio a bit
One thing to remember, if you raise the rearend too high, it throws the cg farther forward and thereby, adding extra weight to front suspension parts. I have the stock suspension front and rear with 225/70-15 in the front and 235/70-15 in the rear. Just a little rake but thats what i like
I have heated old springs once to drop the car down to see exactly how low I wanted it, then had springs made to match the old ones. Worked out perfect. Or you could use V6 springs and drop a V8 in a get the same effect.