Quit thinking about cams till you know what your compression is and what rear gear he can live with
lots of good points above about the big gear spread with the three speed and you evidently have the 8 1/4 rear end with that 3.43 gear
did you ID the pistons yet?
if it is low compression here are some target cam keep your eye on the intake close point (early) and 200 duration (more)
Howard 1.6 1.5 lobe duration .006, .050 200
HM2063164A .506 .475 .316 [email protected] [email protected] 126@200
Hughes
504-512 473-480 325-320 206-210 113 lca -6 32/ 42 -12 -18 olap HUG SEH0610BL-13
Voodoo
VD .484 ,454,,.302 253 208 (stock 340 cam is 209 but really long seat timing kills the low end- this one gets the intake shut earlier to build dynamic compression
ones above do also
dual pattern voodoo
454/454 253/256 208/213 112 VD 10230700 54.5 [email protected] same intake close point as 256 comp cam
Jones 491 461 307 256 @ 202 This is a max area asymetrical grind fill this out Street Performance | Jones Cams and let mike run your build through his computer program once you figure out what you have and what you want feed mike those flow numbers let us know what he says- after you run that compression test
if you find out you have high compression pistons you would consider a different set of cams
There are solid lobes out there Comp cams MM6580 560 w 1.6 525 w 1.5 261 @.020 [email protected] 153@200 (more duration than any of the HYD shown above)
but you are going to need EDM lifters, more spring, etc IDK if it is worth it for a street ride In fact I would NOT do it for a street ride MM series are race cams
no 250 cams with 550 lift with 1.6 rockers
HR cam 260 you can get 523 and 264 you can get 544 but no use looking without all the details