IM new to this forum as I am new to BBC engines, I have always been a sbc fan but I have finally been converted after hearing the similar phrasing of "cubic inches means everything"..soo I swapped a tired 355 for what I was told was a 454. here are the numbers
driverside rear 14015445
rear middle k-20 (or k20-3 or k20-8)
behind flywheel HP PASS
above flywheel T14
block is stamped CE1139641
heads are 346236 pass (I forgot to write down the head date codes)

MY small amount of digging online says light duty pickup truck with peanut port oval heads but I cant find a horsepower or torque rating not to mention cc or compression ratios. I cant find a date code.

regardless it will be going into a 1981 swb 2wd C-10 and running with an automatic not sure if I wil go with a glide a th350 or a lockup 350 400 or a version of an R4 200-700 I have just about all of them laying around. Im sure the rear gear in the truck is 3.08 -3.42 I wouldnt expect any thing numerically higher than that as its a 10 bolt drum.

Here is my goal, it will be a daily driver but Im wanting atleast 450tq and the ability to rev to atleast 5000 - 5250 rpm. The hp range is not critical to me but 400+ should be easily done with this many cubes if cubes really matter.

so I guess I am asking what to bore to and what cam specs I will need as well as some port and polish ideas on the heads.

IM not looking for the golden trick to run a 10 second 1/4 with what I have here, Im looking to maximize what I have by throwing a few bucks at it vs buying a big name aluminum head package, I will use an airgap intake and I have a fresh 750 dbl pumper. the truck weighs in at about 3800 lbs I will be satisfied with anything in the low to mid 13 second range in a 1/4( if you want an idea of my thoughts on performance), and as always anything faster is just a bonus..

Thanks in advance

OHH and Happy Holidays