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Please suggest me the appropriate Georeference system for QGIS 3.4 (MAC OS) for the following GPS User Grid System conversion:

M E    Indian Bangladesh 037 +8.606550e+02 +2.836137e-05 +289 +734  +257 G P T 0 84 500000 0 180 0 0.9999 0 6 7   G L 46 0 91 75 4999999 0000000 999999 0000000

However I have used the following conversion as User grid, but it gives some meters errors (discrepancy) while transformation of coordinates:

+proj=tmerc +a=6377276.345 +b=6356075.41314024 +units=m +y_0=0 +x_0=500000 +lat_0=0 +lon_0=84 +towgs84=296,732,273,0,0,0,0 +nodefs.

Or, Also Please suggest me the projection string for the following parameters :

Position Format Parametes: Longitude Origin = E84 Latitude Origin = 0 False Easting = 500000 False Northing = 0 Scale = 0.9999 Dx = 296 Dy = 731 Dz = 273
Da = 861 Df = 0.280

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