<p style=”text-align: center;”>Hi Garrett , I believe the id19 used much the same block as the traction up to 1965 . The early four speed box mated to this engine will fit the traction block but there’s an issue with the length of the bellhousing to be resolved . Also of course there’s drive shaft flanges , gear change mechanism , clutch operation to be considered .</p>
Roger Williams is the expert in this field , his articles in fp from some years ago are well worth digging out .
Hope this helps , look for a pre 66 gearbox .
Cheers , Andrew Tweed .