Have a chance to pick up a 5.0 out of an 88 Crown Vic with about 90K miles on it for fxjr's mustang. Have heard it run and sounds perfect. Engine will include all accessories. Are these models speed density or mass air? We have the option of going with a carb system, besides the CV intake won't work on a mustang (exists wrong side)so we'll have to change it out anyway. Do you think $190 is fair? Thanks!