KIlled my 904

Was out in mexico doing some 0-60 type stuff, just messing around. After 3rd pass trans started making a slight grinding/rotating sound.. coming from forward section. I was able to move it under very light throttle,every gear the same. Reverse did little better for a minute. Im thinking the input shaft may have broke?
Info on car
69 crew cab valiant
mild 318, loose converter. 8.8 3:73s with traction lock and drag radials.
I can foot brake to 2700rpm, and the hammer it and it dead hooks. Ive been beating on it for a 3 months with current setup.
Need to minimize down time. Where are some good places to work with on a replacement 904?