Tranny linkage adjustment

I have a linkage alignment issue. I have a 64 dart wagon in which I installed an a833. I believe i bought the linkage on ebay and its possibly home made. I pin all the shift levers on the shifter, hook up my linkage and the reverse arm on the shifter does not have enough travel to get it into reverse. Ive tried putting the trans in reverse and heating and bending the reverse linkage to fit but it then will not go back into neutral. I have a feeling this linkage is not the right lengths and this is my problem. Or, the shift levers on the trans are not correct and the throw is not correct. Any expert thoughts on this would be great. Thanks.