904 rebuild help..

iv ordered the following .
summit deep pan (could have re used old one, but as its all going into a fresh 904, why not)
performance automatic race rebuild kit
TCS band strut
TCS pump gear
Mopar sonnix servo
mopar 4.2 band lever
Cope Transmission 24 spring front kit

would it be wise to get a low reverse billet servo too?

im in at over $900 so far just in these few bits, and money is starting to get thin.