also not mentioned is the aluminums capability of shedding the heat quicker then cast...this could or could not help,,again depending on how your sure up makes HP now..

Actually,aluminum is a heat SINK.It absorbs heat quickly,but releases it very slowly.Cast iron actually gives up heat better.Not trying to be a smart aleck :D

Man, too bad you did not have a need for 335's. I got a nice set of Darts in the classifieds. Pro 1 CNC complete with headstuds and push rods that I would take $3K for.

I think it would have to pick it up some. Like others have said you are going to save alot of weight I'd guess close to 50Lbs..plus the flow, chances are the heads you have don't flow that well compared to the aluminum ones. I'd have to guess you'd pick up 2-3 tenths once everything works together..Cam,Carb,ect..

the brodix heads i'm wanting(158-1021001)what all will i have to do to them(port polish )or are they ready right out of the box,,,thanks steve

Another thing... with aluminium you can run a little more compression on the same grade of fuel. I switched to pro1's last year and bumped c/r to 12:1 and still run 91 oct pump gas. My old ported 461's wouldn't take more than 38 deg total timing. Pro1's like 44 deg total. I saw a big gain, picked up 7 tenths.

AFRS
 

A buddy of mine went from camel humps on a 11.5 to 1 406 to 195 afrs in a 72 chevy truck. ets went from 12.30 to 11.81. He didnt change any thing else. AFRS ARE THE WAY TO GO!!!

Those I think should run well on your 355 the runner size is good and the valve size. You could run them out of the box but if you want max performance then having someone who knows their stuff port them ect.
Just remember you will most likely pay upwards of $1000 or more for the work if it is done properly. But it will run it's best. :)

i'm running 110 oct right now,,i was running 6.93 at 38% moved timing to 40% and now run 6.84,

last saturday went 5 passes6.89,6.88,6.88,6.88,6.86 00.10 redlight,the sad thing is i could of cut a 05 an still beat the guy,oh well,,,,steve

Re: AFRS
 

did he run them straight out of the box or had them worked,,,steve