Inline 6 upgrades and recomendations???

[72freak]

I brought home a 1967 Short, step, 2x4 last week and started to play with it. Once I cleaned it out, pressure washed it, aired the tires and got some gas running through it I realized I have a failry nice, fairly rust free, good running truck. I have never done much with the inlines so after reading a few links I figured I would ask what recomendations you inline guys have for it.

It obviuosly has been someones project/baby because it has had some things done to it. Header and HEI.

Also..I have seen a few tranny links but I will ask anyway........it has a three speed converted to the floor. What 4 or 5 speed can I hook to it EASILY?