Any advise on Parker 275 engine upgrade to Beta 14. Is there a specific model or gearbox type that is recommended . Any tips or tricks to install, any drawbacks to consider. Many thanks Russ

Russ
I have a Beta 14 in my superseal, but the 275 is heavier, I would install the 20, or at least the 16. Standard gearbox is 2:1.
You will probably need the shallow sump as well.
Their website has lots of information and they are very helpful on the phone.
If you are replacing a Yanmar you can probably get them to fit engine mounts to suit.
There is probably a dealer closer to you but Luke Cutler, Cutler Marine is the agent at Emsworth, he helped me fit a new Beta 14 in The Rascal last winter.
Philip

Yes, start by reading the excellent Installation and Operators manual available at Beta Engines online which lays out the finer points of an installation.
https://betamarine.co.uk/portfolio/beta-14/ 
Particular points that came up in the install of a Beta 16 in our 27:
The section on Wet exhausts - check dims carefully and consider the heeled condition ,possible need for a raised injection bend and anti siphon loop.
If you are replacing an older engine you will probably find that the water intake and exhaust diameters required are greater than any existing engine ,even for the same output.
Apart from the sizing consideration once you have good access to the rear space behind the engine and scrutinise whats there you are likely to be renewing everything except perhaps the teleflex.
Your present propellor may no longer be suitable for the differing ratio of the new gearbox.
There's an 'installation bank' of yacht types/engine ratings on the website at :
https://betamarine.co.uk/seagoing-yacht-listings/ 
The P275 is not listed currently but an installation is likely to have been made.Beta might recommend the 16 which is only 5kgs heavier and based on the same Kubota.
Once you have read the installation manual you might decide to go via an approved installer who should be hot on all these wrinkles..