408 4x4 build

I know I don't belong here lol, but it seems alot of knowledgeable sb stroker guys hang out here. I'll have a dart/duster/scamp some day, although I'd rather have a challenger/cuda/roadrunner. I love all mopars and were all the same family at heart so don't flame me for being on FABO with a 4x4 lol.

I need some tips w/ building a 408 for my 86 W150

This truck will be street/hwy driven 10-15days a month so its not a daily driver but it will still be based more twords tq and mpg. The truck has 3.55 gears w/ 31" tires and stock stall w/ the std 3spd 727 and part time 208.

Heres my build in progress, I don't have everything yet. Still need short block and heads. All I have is the block, carb, intake, rockers, headers, ign, dampner, 6way timing set, cam, HV oil pump.

specs;
'82 360 block .030 over and 0 decked
scatt cast crank
eagle I beam rods
-27cc dish forged kb pistons
edllebrock rpm performer intake
holley 770 sa carb w/ elc choke
mopar alum 1.5 RR's
hooker headers
msd 6al ign w/ 45k volt accel coil w/ 8.8 wires
HEH3742AL cam from hughes

For heads, I think the new Indy/RHS 360 LAX heads w/ 2.02's would be the best bang for my buck. As far as brand new aftermarket as cast non ported heads go.

I should have waited on buying a cam and did more research and asked around, but I wanted to beat the price jump and thats what hughes recommended for my app w/ Indy X heads on 9.5:1. I'm worried its going to be to big for a truck motor on the street w/ short gears.

Specs are 237/242 @ .050 and 548/555 lift w/ 108lsa

Engine Analyzer 3.4 estimated idle vac to be 12.6hg. I'm used to 18-20hg. How will this effect my brakes or idle signal. Would 14-16 be safer. I also tested w/ a 232/238 110lsa that pulled 14 and a 228/232 111lsa that pulled 16hg. Both cams droped peak hp/tq by 500rpm, but Both cams also made 20-30 more torque frome idle to 3-3500rpm were it needs to be in my application.
Idk how accurate EA 3.4 is but they get pretty technical and I gave all the info accuratly from bore/stroke/rod lenght, head flow, runner cc, chamber cc, chmber design, comp ratio, cam specs, header specs/intake specs, elevation, temp, barometric temp the list goes on. They even asks octain level. I'd like to think its accurate. Then agian this was just a 14day trial, its like a $400 program so maybe the results arent accurate w/ the demo.

Whats you thought guys...

Whats the max comp ratio I can run on 89oct, will 9.5:1 be pushing it. Didn't mags run 9.5. What cam would you guys recommend.

Thanks, Dustin