LS swap - what else will I need?

[hpcgmc]

I've decided to put a ls motor in my 67 GMC, mostly because I found a somewhat local engine supplier with a pretty good price.

Pacific Fabricators in Gilroy, CA has 4.8l motors for $1750 (5.3 for $2,500) They say most have under 100k miles. The engine comes with all accessories (ecu, a/c, power steering, fuel injection system, MAF, exhaust manifold, etc), they flash the ECU and they custom build a wiring harness for your application. They've got motor mounts adapter plates for $75 to mount to existing sbc motor mounts. Motor also comes with a 12 month warranty, they can usually tell you what model car it came out of and sometimes the mileage.

Since I'm not a fabricator, I like that they have sorted out alot of the issues, but want to know what I'm in for to minimize surprises.

I assume I'll need the following:
radiator/fan/shroud/hoses
modify or replace my existing exhaust pipes
fuel pump (I saw a post about a Walbro 255) - I will be using stock behind the seat fuel tank
wiring harness (I planned on replacing the entire truck wiring harness anyway)
gas pedal cable routing
clutch and flywheel (Pacific Fab quoted me $650)


What am I missing?
Where do you normally mount the ECU?
Is there a consensus on fuel pump for the stock tank?
Is there a consensus on a good gas pedal cable kit?
Is it worth an extra $750 for the 5.3?

Thanks!