Stihl 041 Farm Boss Shop Manual

I picked up a used Stihl (70/80's) Farm Boss 041 Chainsaw. Looks very clean for older one but..fires up and only can keep running about 30 sec. It evebtually loads up with gas and dies! If I keep air cleaner off so carb is completely exposed..seems to run slightly better and longer. There is a constant 'spiting' of gas or 'mist' of it coming out of mouth of carb while trying to start? seems like flooding after 2 pulls. then if starts get it to clear for few seconds then starts to load up again? Here is what I've done: 1) new plug 2) complete carb clean several times..and all new gasket kit. 3) new point's (set at .015) 4) replaced fuel line from tank to carb and pulsating line from carb to case. 5) pulled line and filter up out of tank and inspected very close..looks perfect as well as screen in filter. I don't think it is fuel delivery problem as fuel spits out onto my hand (with air cleaner off) and seems flooded always. It had 'spark' before replacing points..and does now with new ones..I'm wonering if this sounds like 'seal' problem? I almost wondering if the 'chain oil' somehow seeping into case..saw what looked like oil in cylinder while tore down- seemed to thick to be gas/oil mix..? any Ideas?..getting into too much money on this for a used saw. Thanks- Geno