D21 clutch issue.. Any ideas?

G'day boys and girls,

I have a 91 d21 4x4 Z24 engine, which I bought off a good mate.

Recently done an engine change, I've put it all back together now and it's running but there is an issue with the clutch. It's slipping a bit under load or when you really put the foot down. The clutch feels like it's right at the top
Of the pedal.

It's a fairly new clutch plate and pressure plate and the flywheel was fine.. There was no issue with the clutch before engine swap. Brand new slave cylinder.

Any suggestions would be appreciated need it sorted ASAP! Cheers guys

I'd be giving it a really good bleed first. They can be a pain sometimes. I'm not sure if the navaras can have the master cylinder pushrod length adjusted at the top of the pedal, but that would be the next thing to check.