HELP! Cannot Attach Heater Core Hoses...

[jrobinsonchicag]

I did an engine swap and am down to the last couple of steps. I cannot get my heater core hoses to attach at the firewall. I tried forcing them on, but they just won't go. What's the deal...

I've attached an image below and highlighted the area in red...

 

[tag4car]

are they not reaching or will the tubes not fit?