13b series 4 engine non turbo questions?

[cmybug]

Hi there guys/gals,
im glen from Australia and new member here.
I recently just brought a complete running 13b series 4 non turbo 6 port engine for $800 aus!
came with 3 month warranty.

now im finding out that this series 4 13b 1988 non turbo engine is not very good to build with !?

some rotary shops here in oz are saying im waisting my time with this engine ?

why is is this ?
im hoping this statement could be wrong!

my plan was to add a 48 mm ida weber,a good flow exhaust,bridgeport it and lighten,balance and blue print it!

is there anything that can be done to modify and make this engine into some thing good?

do any of you guys have on here good experience and results with this engine please ?
what sort of power can be made out of this engine please ?

I want to keep this engine non turbo!

also I have heard guys saying before you can add two stroke pre mix oil in with your fuel to help lubricate and protect the engine better ?

would luv to here your thoughts on this pls!
kind regards
glen