Maybe you should list what problems your having.
DRB have been doing that wide engine bay for a while now...or have you had your chassis for a while. Currently at their workshop they have chassis fitted with 4.6 modular & a very recent looking 1UZ-FE...a lot newer looking than 1UZ-FE we dropped into the Harrison.
They stopped production for 6 weeks to change that engine bay...now that's a big investment.
The main thing I would check is that you have the updated manual if you have the first of the chassis. You can check by looking at details for steering column location, it will be obvious if it is right or not...the change is most noticable there.
One thing for sure with DRB is build quality...it's very good and they are most consistent of Cobra builders here I reckon. The owner Peter Ransome can tell you exactly how much glass & resin goes into each body...it's exactly(well close to) the same for each one. They even use templates for cutting out the glass sheets to ensure consistency.
If I remember I'll ask the builder there if there is anything to watch with fitting modular.
