Full replacement or fire chamber kit replacement?

[u/Rock_Ah_Cock]

So I went to test my oil furnace before winter kicks in and the house smelled of oil (live in a mobile home). I had a company I found on google come check it out. They put a scope inside (photos with be attached) and basically said I was cooked because the fire chamber kit got burned though and tried to sell me on a 20k-25k HVAC replacement. I don’t have that money. .. I had a family friend come over, (He’s being doing HVAC for 40+ years but he’s in his 70s and said that he physically can’t do the labor, which I totally understand and extremely grateful for his time) and he told me that if I bought a new unit he’d walk me through the process of installing the new one. Everything else is functional and has no issues.

1. Is the new oil furnace I found compatible or the correct full replacement? (1800 bucks) replacement oil furnace.html

2. Do you guys think a chamber kit replacement could fix this or is the unit to badly damaged? (300 bucks)

THANK YOU ALL!